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110.444,55?. Patented Jan. 13,1891.

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:raus ab.. muro-uma., msmnarau n c UNITED STATES PATENT OEEICE.

CHARLES BURGESS, OF NEIV BRITAIN, CONNECTICUT, ASSIGNOR TO THE RUSSELL tb ERIVIN MANUFACTURING COMPANY, OF SAME PLACE.

KNOB-SHAN K.

SPECIFICATION forming part of Letters Patent No. 444,557, dated January 13, 1891.

Application filed September 17, 1890. Serial No. 365,276. (No model.)

To all whom it may concern,.-

Be it known that I, CHARLES M. BURGESS, a citizen ot the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Knob-Shanks, of which the following is a specification.

My invention relates to improvements in knob-shanks; and the main object ot' my improvements is economyof production by avoiding the employment ot' a core or chill that requires to be removed from the interior of the shank.

In the accompanying drawings, Figure l is a longitudinal section of my knob-shank with knob attached. Figs. 2 and 3 are side elevations of the shank as viewed from different sides. Fig. 4: is a plan View of the blank for the tube that forms the spindle-socket and butt, and Fig. 5 is a perspective viewof said tube.

The body ot the shaft A is of cast metal of an ordinary form; but, instead of forming the spindle-socket a on a steel chill or core, I form the same of a sheet-metal tube of a length long enough to form also the butt h, by which to secure the shank to the knob Bby running in material 6, the same as the butts of other shanks are secured to knobs. I also form in the butt Z) suitable holes, as at 7 7, for the soft metal to run through in securing to the knob, and I prefer to form said holes at the corners, as shown. These holes can be punched in the blank, as' shown iu Fig. 4, and the blank bent and rolled into a square tube by bending along the broken lines, (shown in Fig. 4,) thereby changing said blank from that form into the form shown in Fig. 5. If

desired, the blank may be punched or swaged at one or more points along its body or on different sides to form slight swells or projections on the outside of the tube, Fig. 5, for better securing the` tube and shank together in casting. The blank and the tube made therefrom I prefer to make a little longer 45 than the combined finished knob-shank/and butt, so that both ends of the tube may project beyond both ends of the print in the mold for casting the shank A. The pattern for the shank should be of the desired form, with 5o a projection at each end of the same size and shape as the tube that forms the spindlesocket and butt. Afterwithdrawing the pattern the tube 5 is placed inthe mold with its ends resting in the prints formed by the afore- 5 5 said projections at the ends of the pattern,in the ordinary manner of setting a core in coreprints Within a mold. The knob shank is then cast around the tube, and thereby iirmly secured thereto, and, inasmuch as the tube is 6o of the proper form and size for a spindlesocket, there is no sand or other core to remove from within the knob-shank. So much of the tube as projects from the angeless end or front end of the shank may then be 65 cut off.

I am aware of a prior patent for a sheetmetal knob-shank consisting of a square sheet-metal tube with a separately-formed sheet-metal collar for forming the flange of 7o the knob-shank, and the same is hereby disclaimed.

I claim as my invention- The herein-described knob-shank, consisting of the internal tube and the metal knob- 75 shank A, cast around said tube, the front portion forming the spindle-socket Within said cast-metal shank, while its rear portion projects therefrom and forms the butt b for the subsequent attachment of a knob, substan- 8o tially as described, and for the purpose speciied.

CHARLES M. BURGESS. lVitnesses:

T. S. BISHOP,

M. S. WIAED. 

